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The accident happened at around 2.40pm between junctions 11 and 12, affecting traffic heading into Saffron Walden and Essex in the southbound direction.

The northbound carriageway is not affected.

The road has now been closed for nearly four hours but will remain shut 'until later this evening' due to the severity of the incident.

Accident investigation teams are now on the scene and have begun their work into the collision that has shut the M11 for most of the afternoon.

Other drivers have mentioned that debris is across the carriageway as they were stuck in standstill traffic behind the accident for two hours.

One person tweeted: "Anybody who’s just driven northbound near Cambridge on the M11 would have seen a horrific accident scene on the other carriageway.

"I can’t see Southbound reopening for the rest of the day."

Another person tweeted that they saw drivers heading in the wrong direction, and brought up the concern that this lane is only used by emergency services.

She said: "Drivers stuck in this traffic actually turning on the M11 and trying to drive back to the last junction on the hard shoulder against trapped traffic. I hope a fire engine doesn't need to get to the scene of the accident."

Another driver confirmed this by stating he saw cars 'reverse up the slip road' when they entered the trapped traffic.

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There were several emergency services at the scene, with at least three police cars, two ambulances and an air ambulance that landed.

Another person stuck in the traffic said that she had not moved in more than two hours before traffic was released back the wrong way on the motorway.

The driver, who wishes to remain anonymous, said at about 4pm: "I've been sat for about an hour, there must be at least three police cars and a couple ambulances that have drove past me to the incident, someone in a hi viz walked down and said all cars will have to turn around at some point.

"I can't see the accident from my car but I can only presume its something big."

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Paramedics from the Essex and Herts Air Ambulance, East of England Ambulance Service, as well as officers from Highways England, Cambridgeshire Constabulary and Essex Police have rushed to the scene.

Highways England tweeted: "Cambridge Constabulary investigation is underway following a serious collision M11 Cambridgeshire southbound between J12 Cambridge and J11 Trumpington. Road is likely to remain CLOSED for several further hours, approximately three miles of congestion on approach."

Cambridgeshire Constabulary, Essex and Herts Air Ambulance and East of England Ambulance Service have been approached for comment.